Everyone can borrow from this public library only two books _____ and they must be returned within a month.
A．a(chǎn)t one timeB．a(chǎn)t timesC．a(chǎn)t the timeD．a(chǎn)t a time
D
本題的含義是每個(gè)人每次可以在圖書(shū)館借2本書(shū)，他們必須在一個(gè)月內(nèi)歸還。at a time可以表示一次或每次的意思，故本題選D。
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